The Ontological Argument for the Existence of God

[robvalue]

It seems to me nothing could possibly ever rule out solipsism.

Nothing could even rule out dreaming. I know people come up with all criteria for when they are dreaming and when they are not, but they can't tell whether all that is just part of the dream.

You could be having a dream where you are, in the dream, having a "lucid dream" that you are "aware" is a dream.

But again, no practical implications whatsoever. It's just an interesting barrier to complete knowledge. There is no need to rule out solipsism any more than there is to prove there is no God or whatever.